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Old 06-24-2006, 11:50 PM   #1
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Crystal Exchange?

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Here's a question for the electronics guru's. If I have a channel 32 transmitter (JR 652) and I'm buying a receiver (JR 600) originally on channel 19, can I simply stick a channel 32 crystal into the receiver to make it compatible with my transmitter? Some people I talk to say yes, others say no.What's the official word? Thanks,

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Old 06-25-2006, 01:21 AM   #2
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Unofficially, I've been buying a bunch of receivers lately. They are the 700 series of JR, but they don't specify high or low band. TX is a definite nono to swap crystals IMO, but withthe JR receivers, it's not a problem for myself or all the guy's I fly with who fly JR (we've been doing a bunch of swapping lately, it's mostly gear that's less than a year old though).

Futaba receivers are typically "tuned" to a certain range of crystals. They are either hig, low or in the middle. Low is from channel 11-30 something, and high is the rest up to 60. Sometimes they are tuned to be in the middle, not sure if this means for all frequencies, or a section in the center. They are differentiated by three dots, and one of them is blacked out, indicating the range it's tuned for. I think this is a quirk of the dual conversion receivers, and JR is single conversion AFAIK.

Not a definite answer I know, but you could always swap the crystals and do a very thorough range check, even going to the limits of your range, with engine running etc.

I would do it with JR or Hitek. I wouldn't even think of doing that large of a swap with Futaba.

Again, this is only for the receiver. I'd never swap transmitter crystals.
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Old 06-25-2006, 10:07 AM   #3
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Thank you Mike. At least you are speaking from actual experience, not just theory, and that's something I have respect for. Now my next question is, where do I get a ch 32 receievr crystal? Can I just order one from a hobby supplier? Thanks.

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Old 06-25-2006, 12:18 PM   #4
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I run Futaba equipment so cannot comment on the JR side but would give you a couple of tips as I swap crystals fairly often.
The crystals should be available at most Hobby Shops or by mail order. Where I notice on the Futaba is that there are 2 different numbers. One is for dual conversion and the other I believe is single. So when you order have your old one in hand in case they are looking for a model/part number. Also as mentioned do the range checks before and after the change. I always after like somebody if they are close to my frequency (like the next number) (both) back up about 25 paces and both turn on and see if you are getting interferance. This to me is just peace of mind.
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Old 06-25-2006, 01:27 PM   #5
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There is no problem changing receiver xtals on JR equipment. The only thing you need to watch for is whether the receiver is single or dual conversion.

Single conversion JR xtals have a grey coloured case, while dual conversion xtals have a red case.

Happy flying,

Dennis DuBois
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Old 06-26-2006, 01:11 PM   #6
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OK, so the consensus seems to be that it should be no problem to do this w/JR equipment provided a thorough range check is done. Thanks everyone.

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Old 06-26-2006, 03:01 PM   #7
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the other thing to watch for with JR is the 3 dots on the crystal. they say if the TX crystal is centre tuned
ie; the center dot then there shouldnt be any problems try to avoid having the dots on the Opposite sides, as some range may be affected but not normally noticed.
JR rx's usually cover the complete range channels 14 to 60 with the grey capped and 11-60 in dual and synthesized. there are also some receivers out there marked high and low but they do not seem to be affected with a crystal swapped. (did a ask Danny on RCU)
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